Purpose: Diabetes mellitus is a global health problem with high prevalence worldwide. It is estimated to affect 4.4% of the global population by 2030. Proper care of diabetes is essential and patient’s knowledge is vital as diabetes healthcare is primarily self-care. The main objective of this study is to explore the effect of dietary knowledge on the control of type 2 diabetes mellitus. 150 respondents were selected randomly from public and private clinics in Khartoum State.Findings: A strong negative relationship was found between age and level of knowledge. 32% of the respondents were found to be highly educated. A positive relationship was found between the level of knowledge, education and income. There is ignorance of the role of dieticians in Diabetes management.Methodology: Data was collected through a questionnaire which included demographic data, medical information and dietary patterns. Level and source of knowledge were assessed. Blood sugar was measured using the glucometer and tested against the level of knowledge (SPSS, version 11) used for analysis.Conclusion: The study emphasises the role of dieticians in dietary control of type 2 diabetes mellitus, including educating poor families on the cheap, nutritive food available as well as in explaining the glycemic index of some local and indigenous Sudanese foods.Keywords: Diabetes mellitus type 2; Dietary control; Knowledge